[vsnet-grb-info 9074] GRB 100331B: Swift/XRT possible afterglow candidate
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Fri Apr 2 09:38:18 JST 2010
TITLE: GCN CIRCULAR
NUMBER: 10562
SUBJECT: GRB 100331B: Swift/XRT possible afterglow candidate
DATE: 10/04/02 00:38:12 GMT
FROM: Valerio D'Elia at ASDC <delia at asdc.asi.it>
V. D'Elia and G. Stratta (ASDC) report on behalf of the Swift Team:
Swift began a target of opportunity observation of the SuperAGILE detected
GRB 100331B (Del Monte et al., GCN #10560), at 14:38UT on April 1st, 2010,
about 17.5 hours after the SuperAgile detection.
We have analysed 2.1 ks of XRT data, from 63152 s to 69.7 ks after
the BAT trigger.
The data are entirely in Photon Counting (PC) mode. Using 1839 s of PC
mode data and 2 UVOT images, we find an enhanced XRT position (using
the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1
catalogue): RA, Dec = 303.02160, -11.10810 which is equivalent to:
RA (J2000): 20 12 5.18
Dec(J2000): -11 06 29.0
with an uncertainty of 2.0 arcsec (radius, 90% confidence). This
position lies 3.2 arcmins from the SuperAGILE reported position. We
currently cannot confirm if this source is fading.
This circular is an official product of the Swift/XRT team.
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